What potential issues can arise when passing variables using hidden fields in PHP forms?

One potential issue when passing variables using hidden fields in PHP forms is that the values can be tampered with by the user, leading to security vulnerabilities. To solve this issue, you can use server-side validation to verify the integrity of the data before processing it. 

<?php
// Server-side validation to verify the integrity of hidden field values
if ($_POST['hidden_field'] == 'expected_value') {
    // Process the form data
} else {
    // Handle invalid data
}
?>

Keywords

security vulnerabilities data manipulation cross-site scripting form validation session hijacking

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